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Not who you're looking for? Others named Mercer County: county in North Dakota, United States · county in Illinois, United States · county in Pennsylvania, United States · county in Kentucky, United States
Mercer County is a county in Southern West Virginia on the southeastern border of the U.S. state of West Virginia. At the 2020 census, the population was 59,664. Its county seat is Princeton. The county was originally established in the State of Virginia by act of its General Assembly on March 17, 1837, using lands taken from Giles and Tazewell counties.